Shrub rose plant named ‘KORtuberlou’

ABSTRACT

‘KORtuberlou’ is a new and distinct variety of  Rosa hybrida  which is characterized by the combination of an upright growth habit, a moderately vigorous rate of growth, panicles bearing five to nine yellow flowers which are margined pink, double flowers with light fragrance, and excellent resistance to common rose diseases. The new variety propagates successfully by stem cuttings and grafting and has shown to be uniform and stable in the resulting generations from asexual propagation.

Latin name of genus and species: The Latin name of the genus and speciesof the novel variety disclosed herein is Rosa hybrida.

Variety denomination: The inventive variety of Rosa hybrida disclosedherein has been given the variety denomination ‘KORtuberlou’.

STATEMENT REGARDING PRIOR DISCLOSURES BY THE INVENTOR UNDER 37 C.F.R.1.77(B)(6)

The first public disclosure of the claimed plant was made in Germany, inthe inventor's retail catalog, first mailed on Sep. 1, 2015.‘KORtuberlou’ was not publically available or sold prior to one yearbefore the date of the instant application.

BACKGROUND OF THE INVENTION

Parentage: The Rosa hybrida variety ‘KORtuberlou’ is the result of acontrolled cross-pollination breeding program carried out by theinventor in Klein Offenseth-Sparrieshoop, Germany. The objective of thesaid breeding program was to create a new and distinct rose plant withunique qualities, such as:

-   -   1. Uniform growth habit and uniform flowering; and    -   2. Abundant, recurrent yellow flowers that are margined pink;        and    -   3. Attractive and abundant foliage; and    -   4. Resistance to diseases encountered in landscapes and gardens.        This combination of qualities is not present in prior rose        cultivars known to the inventor. These objectives have been        substantially achieved and in that distinguish ‘KORtuberlou’        from all other varieties known to the inventor.

‘KORtuberlou’ is a seedling selection which resulted from the controlledpollination of Rosa hybrida ‘KORquelda’ (U.S. Plant Pat. No. 17,048),the seed parent, and with an unnamed Rosa hybrida seedling (unpatented)developed and owned by the same inventor, the pollen parent, during thesummer of 2002. As part of a rose development program, Tim-HermannKordes germinated seeds from the aforementioned hybridization during thefollowing winter and conducted evaluations and observations on theresulting seedlings in a controlled environment in KleinOffenseth-Sparrieshoop, Germany. The resulting seedlings exhibiteddistinctive physical and biological characteristics. The new rose plantwas selected as a single plant in May of 2003 from the seedling beds dueto its superior characteristics and asexually propagated for furtherevaluation. This new and distinctive rose variety was given the name‘KORtuberlou’.

Asexual Reproduction: ‘KORtuberlou’ was first asexually propagated bybud grafting in July of 2003 at the inventor's nursery in KleinOffenseth-Sparrieshoop, Germany. Subsequently, ‘KORtuberlou’ has beensuccessfully propagated by stem cuttings and bud grafting in JacksonCounty, Oreg. These initial and other subsequent propagations conductedin controlled environments demonstrate that ‘KORtuberlou’ reproducestrue to type in successive generations of asexual reproduction.

SUMMARY OF THE INVENTION

The following characteristics have been repeatedly observed andrepresent the distinguishing characteristics of the new Rosa hybridacultivar ‘KORtuberlou’. These traits, in combination, distinguish‘KORtuberlou’ as a new and distinct cultivar.

-   -   1. Rosa hybrida ‘KORtuberlou’ exhibits a moderately vigorous        growth rate; and    -   2. Rosa hybrida ‘KORtuberlou’ exhibits an upright growth habit;        and    -   3. Rosa hybrida ‘KORtuberlou’ exhibits panicles bearing five to        nine yellow flowers which are margined pink; and    -   4. Rosa hybrida ‘KORtuberlou’ exhibits small, double flowers        with a light sweet, fruity fragrance; and    -   5. Rosa hybrida ‘KORtuberlou’ exhibits excellent resistance to        rust, black spot disease, Botrytis and powdery mildew.

BRIEF DESCRIPTION OF THE DRAWING

The accompanying color drawing shows as true as is reasonably possibleto obtain in color photographs of this type, the typical characteristicsof the buds, sepals, reproductive organs, flowers, leaves, prickles, andstems of ‘KORtuberlou’, taken from a three year old plant.

DETAILED BOTANICAL DESCRIPTION

The following is a detailed botanical description of a new and distinctvariety of Rosa hybrida known as ‘KORtuberlou’, based upon observationsmade in June of 2016 from three year old, field-grown plants in JacksonCounty, Oreg. Those skilled in the art will appreciate that certaincharacteristics will vary with older or, conversely, with youngerplants. ‘KORtuberlou’ has not been observed under all possibleenvironmental conditions. Where dimensions, sizes, colors and othercharacteristics are given, it is to be understood that suchcharacteristics are approximations or averages set forth as accuratelyas practicable. The phenotype of the variety may differ from thedescriptions set forth herein with variations in environmental, climaticand cultural conditions. Color notations are based on The RoyalHorticultural Society Colour Chart, The Royal Horticultural Society,London, 2001 edition except where common terms of color are used.

A botanical description of ‘KORtuberlou’ and comparisons with theparents and closest known comparator variety of Rosa hybrida areprovided below.

-   General plant description:    -   -   Growth rate.—Moderately vigorous.        -   Growth habit.—Upright.        -   Mature dimensions.—100 cm tall and 50 cm wide, on average.        -   Cold hardiness.—Grown successfully in USDA Hardiness Zones 5            through 9.        -   Propagation.—Stem cuttings and bud grafting.        -   Disease resistance.—Excellent resistance to powdery mildew            (Sphaerotheca pannosa), blackspot (Diplocarpon rosae), rust            (Phragmidium sp.) and Botrytis diseases under normal growing            conditions in Jackson County, Oreg.-   Root system:    -   -   Type.—Fibrous root system.        -   Branching.—Freely branched.        -   Density.—Moderately dense.        -   Color.—Greyed-yellow Group 161D.        -   Distribution.—Roots distributed evenly throughout the soil            profile, from shallow to deep.-   Stems:    -   -   Stem color.—Young stems are Yellow-Green Group 146B; mature            stems are Yellow-Green Group 146C.        -   Anthocyanin intonations.—Intonations of Greyed-Purple Group            183D are present on young stems.        -   Stem surface texture.—Both juvenile and mature stems are            smooth.        -   Stem dimensions.—Typical mature stems are approximately 40            to 80 cm long and 6 to 12 mm in diameter.        -   Prickles.—Incidence — Typically 6 prickles per 10 cm of            stem, on average. Size — Average length is 15 mm long.            Immature prickle color — Greyed-Red Group 182A. Mature            prickle color — Greyed-Red Group 183C. Shape — Convex.            Texture — Smooth.-   Leaves:    -   -   Arrangement.—Imparipinnate compound leaves; mature axillary            leaves consisting of 7 leaflets.        -   Attachment.—Petiolate.        -   Dimensions.—170 mm long and 110 mm wide.        -   Abundance.—Average; approximately 120 leaves.        -   Stipules.—Size — 30 mm long and 12 mm wide. Stipule color —            Yellow-Green Group 147C. Anthocyanin intonations —            Greyed-Red Group 182C intonations are present on the center            rib of the adaxial surface; intonations of Greyed-Red Group            183D are present on the abaxial surface. Stipitate glands —            A limited number of stipitate glands are present. Margins —            With stipitate glands. Texture, adaxial surfaces — Glabrous.            Texture, abaxial surfaces — Glabrous. Apex — Apiculate. Base            — Flat.        -   Petiole.—Length — Average of 15 mm. Diameter — Average of            3 mm. Petiole color, adaxial surface — Yellow-Green Group            146C. Petiole color, abaxial surface — Yellow-Green Group            146C. Anthocyanin intonations — Greyed-Red Group 182C            intonations are present along the margins of the adaxial            surface; light intonations are present on the abaxial            surface. Margins — With scarce stipitate glands. Prickles —            A few small prickles are present. Stipitate glands — Limited            number of stipitate glands. Texture — Glabrous. Strength —            Strong; stiff.        -   Rachis.—Length — Average 35 mm. Diameter — Average 2.5 mm.            Color — Yellow-Green Group 146C. Anthocyanin intonations —            Greyed-Red Group 182C intonations are present on the center            rib of the adaxial surface. Margins — A few stipitate glands            are present along the margins of the adaxial surface.            Prickles — A few small prickles on the abaxial surface.            Stipitate glands — A limited number of stipitate glands are            present. Texture — Glabrous.        -   Leaflets.—Dimensions — Average size of the terminal leaflet            is 60 mm long and 48 mm wide. Shape — Ovate. Apex —            Cuspidate. Base — Obtuse. Margins — Serrated; lightly            undulated. Luster, texture and pubescence; adaxial surface —            Semi-glossy, smooth and glabrous. Luster, texture and            pubescence; abaxial surface — Matte, smooth and glabrous.            Juvenile foliage color, adaxial surface — Green Group 137A.            Juvenile foliage color, abaxial surface — Yellow-Green Group            147C. Mature foliage color, adaxial surface — Yellow-Green            Group 147A. Mature foliage color, abaxial surface —            Yellow-Green Group 147B. Anthocyanin intonations — Very            strong intonations of Greyed-Red Group 178B are present            along the margins of the abaxial surface. Venation —            Reticulate. Petiolule — Dimensions — 2.0 mm long and 0.5 mm            in diameter. Petiolule color, adaxial surface — Yellow-Green            Group 146D. Petiolule color, abaxial surface — Yellow-Green            Group 147C. Anthocyanin intonations — Greyed-Orange Group            177D. Prickles — None observed. Texture, adaxial and abaxial            surfaces — Leathery. Margins — Occasional stipitate glands.-   Inflorescence:    -   -   Inflorescence type.—Panicles which bear 5 to 9 flower buds.            Flowers are held slightly pendant.        -   Blooming habit.—Recurrent; very floriferous.        -   Size.—175 mm tall and 170 mm wide, on average.        -   Peduncle.—Length — 60 to 180 mm average length. Diameter —            5.0 to 7.0 mm average diameter. Color — Yellow-Green Group            146B. Anthocyanin intonations — Very strong intonations of            Greyed-Red Group 178A. Strength — Strong. Surface —            Glabrous.-   Flowering laterals: Present below the initiation of inflorescence.    Generally 2 to 5 flowering laterals are present, with 1 to 5 flowers    per flowering shoot.-   Bud:    -   -   Bud form.—Long; pointed ovoid.        -   Size.—Upon opening, 30 mm in length from base of receptacle            to distal end of bud and 15 mm diameter at its widest point.        -   Texture.—Smooth.        -   Color, as sepals first unfold.—Yellow Group 12B with            intonations of Red Group 46B to 46C.        -   Color when one-quarter open, inner side.—Marginal zone —            Yellow-Orange Group 16B with intonations of Red Group 46B.            Middle zone — Yellow-Orange Group 16C. Basal zone — Yellow            Group 7A.        -   Color when one-quarter open, outer side.—Marginal zone —            Yellow-Orange Group 16B with intonations of Red Group 46B.            Middle zone — Yellow-Orange Group 16B. Basal zone — Yellow            Group 13C.        -   Color, outermost petals.—General tonality is Red Group 45C.-   Flower:    -   -   Pedicel.—Length — 50 to 60 mm average length. Diameter — 2.0            to 4.0 mm average diameter. Color — Yellow-Green Group 146C.            Anthocyanin intonations — Greyed-Red Group 178B. Strength —            Somewhat strong. Surface — Smooth.        -   Calyx.—General — Comprised of five polysepalous sepals, with            moderate foliaceous appendages present on three sepals.            Diameter of calyx — 60 mm, at anthesis. Sepals — Color,            upper surface — Yellow-Green Group 147C. Color, lower            surface — Yellow-Green Group 146B. Anthocyanin intonations —            Intonations of Greyed-Red Group 178B are present on the            lower surface. Size — 25 to 30 mm long and 8 to 14 mm wide,            on average. Apex — Cirrose. Base — Flat at union with            receptacle. Quantity — Five. Upper surface — Pubescent.            Lower surface — Smooth. Margins — With stipitate glands.            Stipitate glands — A limited number of stipitate glands are            present.        -   Corolla.—Habit; type — Double. General shape of corolla —            Cup-open; shallow. Shape of corolla when viewed from the            side — Upon opening, upper portion — Flat. Upon opening,            lower portion — Flattened convex. Open flower, upper portion            — Flat. Open flower, lower portion — Flattened convex.            Dimensions — Medium size for a shrub rose. When open, the            average flower diameter is 80 mm and the average flower            height is 50 mm. Fragrance — Light fragrance; sweet, fruity.            Duration — On the plant for 4 to 6 days. Senesced petals            drop away cleanly. Petals — Petal count — Exhibits double            flowers with 25 petals under normal conditions. Petal reflex            — Petals are slightly reflexed. Timing of petal reflex —            Simultaneous. Petal margin — Emarginate. Petal shape —            Obovate. Apex — Obtuse. Base — Obtuse. Dimensions — 30 to 35            mm long and 25 to 40 mm wide. Texture, inner surface —            Smooth. Texture, outer surface — Smooth. Petal color, upon            opening — Outermost petals, inner surface — Marginal zone —            Irregular coloring, ranging from Yellow Group 9C to Red            Group 46B. Middle zone — Irregular coloring, ranging from            Yellow Group 9C to Red Group 46B. Basal zone — Yellow Group            9B. Outermost petals, outer surface — Marginal zone — Yellow            Group 4C, suffused with Red Group 46B. Middle zone — Yellow            Group 4C, suffused with Red Group 46B. Basal zone — Yellow            Group 9B. Innermost petals, inner surface — Yellow Group 13B            and suffused with Red Group 46B to 46C at the marginal and            middle zones. Innermost petals, outer surface — Yellow Group            13B and lightly suffused with Orange Group 24B at the            marginal and middle zones. Basal petal spots, upon opening —            No distinctive coloration at the petal base. Petal color,            after opening — Outermost petals, inner surface — Marginal            zone — Red-Purple Group 61C. Middle zone — Red Group 52C.            Basal zone — Yellow Group 2B. Outermost petals, outer            surface — Marginal zone — Red-Purple Group 61C. Middle zone            — Red Group 52C. Basal zone — Yellow Group 2B. Innermost            petals, inner surface — Marginal zone — Yellow Group 9B and            suffused with Orange-Red Group 32B. Middle zone — Yellow            Group 9B and suffused with Orange-Red Group 32B. Basal zone            — Yellow-Orange Group 9B. Innermost petals, outer surface —            Marginal zone — Yellow-Orange Group 16B. Middle zone —            Yellow-Orange Group 16B and suffused with Orange Group 24C.            Basal zone — Yellow-Orange Group 16B and suffused with            Orange Group 24C. Basal petal spots, after opening — No            distinctive coloration at the petal base. General Tonality —            On open flower, the outer portion of the flower is Red Group            46C and the center is Orange Group 24C. No change in general            tonality at the end of the fifth day; thereafter the general            tonality is Yellow Group 10D, margined with Red Group 52C.            Petaloids — Quantity — 8 petaloids per flower, on average.            Dimensions — Approximately 10 to 25 mm long and 7 to 15 mm            wide. Color, inner surface — Varied; typically Yellow Group            13B and occasionally suffused with Orange Group 25C. Color,            outer surface — Varied; typically Yellow Group 14C and            occasionally suffused with Orange Group 25D. Margins —            Irregular; undulated to indented. Shape — Irregular; obovate            to spatulate. Apex — Acute to obtuse. Base — Attenuate.            Texture, inner and outer surfaces — Smooth.-   Reproductive organs:    -   -   Stamens.—Quantity — Approximately 60, on average, arranged            around the styles. Anthers — Shape — Reniform. Dimensions —            4.0 mm long and 2.0 mm wide, on average. Color —            Yellow-Orange Group 16C. Pollen — Present; abundant. Color            is Greyed-Orange Group 163B. Filaments — Color — Yellow            Group 9B. Length — 6.0 mm.        -   Pistils.—Quantity — Approximately 40. Stigmas — Size —            1.0 mm. Location — Inferior in position to anthers. Color —            Greyed-Orange Group 163B. Styles — Length — Approximately            5.0 mm long. Color — Yellow Group 2D with intonations of Red            Group 46B.        -   Ovary.—Dimensions — 8.0 mm long and 6.0 mm in diameter.            Color — Green-White Group 157C.        -   Receptacle.—Shape — Funnel-shaped. Dimensions —            Approximately 10.0 mm high and 7.0 mm wide. Color —            Yellow-Green Group 146C, with intonations of Greyed-Purple            Group 187C. Texture — Smooth; glabrous.-   Hips and seed formation: Not observed to date.

COMPARISONS WITH THE PARENTS

The new rose plant may be distinguished from its seed parent, Rosahybrida ‘KORquelda’, by the characteristics described in Chart 1.

CHART 1 Characteristic ‘KORtuberlou’ ‘KORquelda’ Flower size. Largerthan Smaller than ‘KORquelda’. ‘KORtuberlou’. Flower type; petal count.Semi-double. Very double. Flower colon. Yellow, with pink at Yellow.marginal zones.

The new rose plant may be distinguished from its pollen parent, anunnamed Rosa hybrida seedling, by the characteristics described in Chart2.

CHART 2 Characteristic ‘KORtuberlou’ Unnamed pollen parent Growth habit.Upright and freely Compact and not freely branched. branched. Diseaseresistance. Excellent. Average. Flower type; petal count. Semi-double.Double.

COMPARISON WITH THE MOST SIMILAR ROSA CULTIVAR KNOWN TO THE INVENTOR

For a comparison, several physical characteristics of the Rosa hybridavariety ‘KORgohowa’, a rose variety from the same inventor which isdescribed and illustrated in U.S. Plant Pat. No. 22,539, are compared to‘KORtuberlou’ in Chart 3.

CHART 3 Characteristic ‘KORtuberlou’ ‘KORgohowa’ Leaf size. 170 mm longand 150 mm long and 120 mm wide. 120 mm wide. Petal count. 25. 50 to 60.Shape of prickles on Convex. Linear. stems.

That which is claimed is:
 1. A new and distinct variety of rose plantnamed ‘KORtuberlou’, as described and illustrated herein.